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CVE-2025-10493

MediumPublished

Chained Quiz <= 1.3.5 - Unauthenticated Insecure Direct Object Reference via Cookie

Published: Sep 18, 2025
Updated: Apr 8, 2026
Assigning CNA: Wordfence
Evidence observed: Dec 25, 2025

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS probability estimate

0.9%

Low · next 30 days

Percentile: 58.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Chained Quiz plugin for WordPress is vulnerable to Insecure Direct Object Reference in version 1.3.4 and below via the quiz submission and completion mechanisms due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to hijack and modify other users' quiz attempts by manipulating the chained_completion_id cookie value, allowing them to alter quiz answers, scores, and results of any user. The vulnerability was partially patched in versions 1.3.4 and 1.3.5.

Sources

Chained Quiz 1.3.5 - Unauthenticated Insecure Direct Object Reference via CookieExploit
0xsabre · multiple · Dec 25, 2025

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